Seasonal allergies are here for spring 2024. What to know about symptoms and pollen count

If your sinuses haven't already alerted you, allergy season is upon us — and it's earlier and stronger than expected.

Spring weather is spreading quickly across the central part of the country, according to the USA National Phenology Network, which tracks climate and seasonal changes and data. Compared to long-term average from 1991 to 2020, Denver is 6 days early, Chicago is 15 days early and Detroit is 23 days early, the network says.

The same was true for last year's allergy season, when several regions of the U.S. experienced springtime conditions weeks early, forcing spring allergy sufferers to deal with symptoms sooner and longer than usual.